Domes are vulnerable to water damage, so what to do in rainy climates? I say add a roof. There are various roofed dome houses on our main website at EarthbagBuilding.com that you peruse here and here. Those are earthbag domes. The design I’m first presenting here is made of ferrocement. It’s just one more way to do things.
“Here is a video which may be interesting for you: Namely the installation of a corrugated metal roof on one of our domes, “Cacao Dome”. This dome (not to be mistaken with the other you have documented – the EcoRancho and/or Majestic Dome, both in La Chorrera) suffered a lot in the rainy season to the point that we could not use as living quarters during the rainy season.